Cam-grinder attachment for grinding-machines.



H. T. SHEARER CAM GRINDER ATTACHMENT FOR GRINDING MACHINES.

APPLlCATlON FILED 050.123.1910. RENEWED AUG. 26. 1915.

Patented Oct. 12, 1915.

2 SHEETSSHEET H. T. SHEARER.

CA'M GRINDER ATTACHMENT FOR'GRINDING MACHINES.

APPLICATION FILED DEC. 19, I910. 1,156,323."

RENEWED AUG 26. I915.

iatented Oct. 12, 1915.

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Application filed December 19, 1910, Serial No. 588,228. mnewdnugust ati, .1915. Serial Ito. Win85.

WayneSbOrO, in the county of Franklin and sate-er Pennsylvania, have invented certain newand useful Improvements in Cam- Grinder Attachments for Grmding-Machines, of which the following is a specification. p I 0 My said inventlon consists 1n var1ous 1mprovements in the. details of construction modifying the arrangement or operation" and arrangement of arts of cam grinding attachments for grin mg machines, whereby such a machine of a common type, as for example, a Landis grlndlng machine, may be readily adapted for grmdmg cams of various dimensions without materially of the main parts of the machine, all as willhe hereinafter more fully described and claimed.

Referring to the accompanying drawings which are made a part hereofand on which similar reference characters indicate similar parts, Figure 1 is an end elevation of an attachment of my improved construction in the position it occupies on the machine, ready for use, Fig. 2 a View partly in front elevation and. partly in section of one oi said attachments, and Fig. 3 a detail section on the dotted line 3--3 in Fig. 1.

In said drawings the portions marked A represent the work-table of the grinding machine, B. the support for the grinding .wheel attachment and C the pivoted frame supporting the bearings carrying the mandrel. The work-table A may be the work-table of any grinding machine of appropriate construction, such as the well known"Landis type above referred to.

. The support B is a casting preferably in the form of a hollow shell adapted to support and inclose the main portions of the cam grinding attachment. It is formed with a flange b on its lower rear edge adapted to engage with the rear edge of'table A a cylindrical part throughout the length of the table. Said sup ort B is of a suitable length to accommo ate the other parts of the attachment and at its upper end is provided with bearings tor the ivot of the hinged frame 0 and is formed with elongated openings 6 m its ends in which the work carrying shaft or mandrel may swing.

The frame 0 comgrises a casting having '--at its upper end in which a pivot shaft 0' is secured by setscrews c.; The ends of said pivot-shaft proect beyond" the ends of-said frame and are journa ed in hearings in the upper end of frame B. By this means said frame is mounted to swing transversely of the table A and toward and from the grinding wheel (not shown). The lower end of said frame carries another cylindrical part C in which are formed bearings for the work and pattern carrying mandrel C .Said bearings are provided with bronze, or other suitable, bushings and mandrel C is mounted therein. At the ends of said frame are formed tubular parts 0 containing channels leading from just beneath oil cups 0* in the top of support B to said hearings to pro- Vide for their lubrication. Said mandrel has a collar 0 on its outer end and sleeve .6 secured. between said collar and pattern to a crank-pin c on a driving wheel C for driving said mandrel and permit it to swing with ,frame (3 during the operation. The pattern, or master-cam.P, is mounted near one end of said mandrel and keyed thereto and near its opposite end the cam to be ground is also keyed thereon. A shoe- C is mounted in a support S in line with the master-cam P. Said support S is secured are inclosed by a cover 0 which is held in,

position by a screw 0 which passes through said cover and into a screw-threaded perforation in the end of arm B A nut a.

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is mounted on said screw to prevent the same from becoming separated from said cover C when the same is removed from position, as when the parts are adjusted. Said shoes are vformed on the arc of a cirole substantially corresponding to the circle of the grinding wheel and are furnished in sets of a number equal to the number of inches wear for which the grinding wheel is adapted, so that as the grinding Wheel 1s worn down inch by inch the shoes are-v changed to correspond. The shoe when put in place is the arc of a circle the diameter of which is one-half inch less than the d1 ameter of the grinding wheel and said shoe is used until the diameter of-said grinding wheel is worn to onehalf inch less than the diameter of the circle of which the surface of the shoe is an arc. By this means the master-cam is supported against thatportion of the shoe which substantially corresponds at all times in shape or curvature with the shape or curvature of the portion of the grinding wheel which is operating upon the work and the Work is thus ground true to its pattern. Immediately beneath the master-cam P T mount an oil pan 10 having hn opening through its top through which the periphery of the mastercam may project. follower 1]. on springs 12 and on top of said follower a quantity of waste, or other absorbent material, 13, which serves to take up the oil with whichthe oil pan is filled a and against which the, periphery of the master-cam contacts when turned to bring its widest point to the position shown in Fig. 1.- lihus at each revolution of the mastor-cam its apex wipes against the surface of said oil saturated absorbent material andpicks up suficient of the lubricant tokeep' the contact surfaces of shoe G and mastercam- P thoroughly lubricated at all times and thus obviate any undue wear betweensaid shoe and the master-cam. h @n the lower side of one end of part C is formed a lug l5 withwhich the nose 16 of a spring mounted push-rod 17 engages.

Said push-rod is mounted to slide in a hearing in lug 18 on support B and a coiled spring 19 surrounds saidpush-rod andbeing interposed between its noselti and the seat within said hearings, the action of said spring will normally hold the swinging hearing (3 with the mandrel G and master-cam P against shoe C at all times. i

The operation is as follows: The various parts being in the position shown in the drawings, the attachment is placed upon the grinding machine, the support B being secured on the work-table A as indicated in Fig. l. The pattern, or master cam, P, is keyed in position on the appropriate end of the mandrel G and the cam to be ground, or 1 work, W is keyed to the opposite end of said intense Tn said pan-ll mount a mandrehas shown in Fig. 2 The grinding wheelof the machine (indicated by dotted lines in Fig. l) is brought into position to operate upon the face of the work and the mandrel (1 connected with the gearing tor driving the same. 'As said mandrel revolves, the master-cam bears upon shoe C and'thus operates to swing-the lira-me C, car

rying the mandrel C and the work W, on

its p vots to maintain the work in the same relation to the grinding wheel as the pattern Imaintains to said shoe. The spring 19 operates to maintain the pattern in close contact with the shoe atall times while per gmittingthe tree swinging motion of the frame carryingithe work. By this means the'work is ground to the form of the pattern automatically and when so ground, or

when the 'rinding wheel is in contact with the :work t roughout the entire revolution of said work,across its entire face, said worlr may be removed and another cam put in position to be ground. The pattern P is changed from time to time and other patterns substituted" corresponding with the form of the work to be ground. Said'patterns are furnished in sets of standard sizes and when special forms of cams'are to be ground the pattern therefor may be made by the original pattern, cut of suitable material. in the usual manner, as will be readily understood.

Having thus'tully described my saidin vention, what I claim as new and secure by Letters Patent, is:

l. A cam grinding attachment for grinding machines comprising suitable supports mounted on the work table of the machine, a swinging framemounted on said supports,

desire to a mandrel mounted in hearings in said frame, means for driving said mandrel, a

pattern corresponding in shape to the work to be ground mounted on said mandrel, a stationary shoe mounted in line with said pattern with itstace adapted to contact with support, said frame being formed withbear-= ings in its lower end, amandrel journaled in said bearingsand extending through slots in the ends of said supports, means for driving said mandrel, a pattern mounted on one of the projecting ends of said mandrel, the

Work mounted on the other end of said mandrel, and a stationary shoe mounted in l1ne with the said pattern and adapted to serve as a bearing therefor during the operation, substantially as set forth.

3. A cam grinder attachment for grinding machines comprising a support mounted on the Work-table of the machine, a frame pivoted in said support, a mandrel journaled in bearings in said frame, a pattern mounted on said mandrel, means for driving said mandrel, a stationary rest for said pattern, a

lubricant container mounted beneath said pattern and formed-with anopening through Which a part of said pattern is adapted to project at each revolution thereof, and the work also mounted on said mandrel, substantially as set forth. I

In witness whereof, I, have hereunto set my hand and seal at Waynesboro, Pennsyl- 20 Vania, this 28th day of November, A. D. nineteen hundred and ten.

HARRY T. SI-IEARER. [L s.] Witnesses:

J. ARTHUR KNAPP, CHAS. B. CLAYTON. 

